Viridans group streptococci — Flashcards

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Viridans group streptococci — Flashcards

10 flashcards

Read Study Notes Questions

Enterococcus spp. are bile-_____ (soluble or insoluble)

What bug commonly causes early endocarditis of prosthetic heart valves?_____

Which spp. of Streptococcus viridans causes subacute endocarditis?_____

Streptococcus pyogenes is also known as _____

Gas gangrene

Gram stain status of Clostridium perfringens

Characteristics of Clostridium botulinum:

What are the key microbiological characteristics and toxins of Clostridium tetani?

_____, _____, and _____ are important spore-forming Gram-positive bacteria found in soil.

#10

What is the causative agent of Diphtheria?

Viridans group streptococci US Medical PG Flashcards - Medical Study Cards

Master Viridans group streptococci with OnCourse flashcards. These spaced repetition flashcards are designed for medical students preparing for NEET PG, USMLE Step 1, USMLE Step 2, MBBS exams, and other medical licensing examinations.

Viridans group streptococci Flashcard Deck - 10 Cards

Flashcard 1: Enterococcus spp. are bile-_____ (soluble or insoluble)

Answer: insoluble (aka resistant)

Flashcard 2: What bug commonly causes early endocarditis of prosthetic heart valves?_____

Answer: Staphylococcus epidermidis

Flashcard 3: Which spp. of Streptococcus viridans causes subacute endocarditis?_____

Answer: Streptococcus sanguinis

Flashcard 4: Streptococcus pyogenes is also known as _____

Answer: group A strep (GAS)

Flashcard 5: Gas gangrene

Answer: Clostridium perfringens

Extra: alpha toxin causes myonecrosis and hemolysis

Flashcard 6: Gram stain status of Clostridium perfringens

Answer: Gram-positive (+)

Extra: Characteristics: - Morphology: Large, box-car shaped Gram-positive bacilli - Oxygen requirement: Anaerobe - Pathogenesis: Alpha toxin (lecithinase) - Clinical: Gas gangrene (myonecrosis), food poisoning

Flashcard 7: Characteristics of Clostridium botulinum:

Answer: Gram-positive bacilli, anaerobic, spore-forming

Extra: Clinical features: Botulism (descending paralysis), Floppy baby syndrome (infant botulism from honey). Toxin: Botulinum toxin (protease that cleaves SNARE proteins, preventing ACh release).

Flashcard 8: What are the key microbiological characteristics and toxins of Clostridium tetani?

Answer: Gram-positive, anaerobic, spore-forming bacilli (drumstick appearance)

Extra: - Tetanospasmin: Neurotoxin that blocks release of inhibitory neurotransmitters (GABA and glycine) from Renshaw cells in spinal cord. - Clinical features: Trismus (lockjaw), Risus sardonicus (raised brows, open grin), Opisthotonus (back arching). - Spores are found in soil; enter via penetrating wounds.

Flashcard 9: ___, _, and ___ are important spore-forming Gram-positive bacteria found in soil.

Answer: Bacillus anthracis

Flashcard 10: What is the causative agent of Diphtheria?

Answer: Corynebacterium diphtheriae

Extra: Exotoxin inhibits protein synthesis via ADP-ribosylation of EF-2. Presentation: Pseudomembranous pharyngitis (grayish-white membrane), cervical lymphadenopathy ("bull neck"), myocarditis, arrhythmias, and cranial nerve palsies.

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Viridans group streptococci Flashcards for USMLE

Study 10 flashcards on Viridans group streptococci for USMLE Microbiology. These active recall cards cover the key concepts, clinical associations, and high-yield facts from this chapter of Gram-positive. Each card is designed to test your understanding rather than just recognition, building stronger and more durable memories for exam day.

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Are Viridans group streptococci flashcards free?

Yes, all flashcards on this page are completely free. You can study all 10 cards at no cost. For spaced repetition scheduling, download the Oncourse app.

How many flashcards does this chapter have?

There are 10 flashcards for Viridans group streptococci, covering the key concepts, clinical correlations, and high-yield facts from this chapter of Gram-positive.

How should I use these flashcards for USMLE?

Read through each prompt and try to answer before revealing the back of the card. This active recall approach builds stronger memories than passive reading. Combine flashcards with the study notes and MCQ practice for the best results.

Are there more flashcards for Gram-positive?

Yes. This page covers one chapter of Gram-positive. Visit the topic page to see all chapters and their flashcards under Microbiology.

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